1. The utility model provides an air flue rolls and flows than quick adjustment device, includes the air flue core box, be equipped with the intake duct in the air flue core box, its characterized in that, the intake throat mouth inboard of intake duct is provided with along circumference position adjustable valve seat circle, the inner wall of valve seat circle is equipped with rolls and flows the closed angle, it is in to roll and flow the closed angle the axial projection of the up end of valve seat circle is the closed angle projection, the closed angle projection form by the inboard edge of valve seat circle along radial to the convex bulge region in center of valve seat circle, the closed angle projection is being followed the width at the ascending middle part of valve seat circle circumference direction is greater than the width at its both ends.

2. The device for rapidly adjusting the tumble ratio of the air passage according to claim 1, wherein one side edge of the projection of the sharp angle toward the center of the valve seat ring is a sharp angle characteristic line, and the sharp angle characteristic line is an arc line, a straight line or a fold line.

3. The device for rapidly adjusting the tumble ratio of an air passage according to claim 2, wherein the sharp corner is projected as a crescent-shaped area with the concave side arranged toward the center of the valve seat ring.

4. The airway tumble ratio quick adjusting device according to claim 1, characterized in that an angle scale mark is arranged on the outer end surface of the air inlet throat in the circumferential direction, and an indicating mark for indicating the scale mark is arranged on the lower end surface of the valve seat ring.

5. The airway tumble ratio quick adjusting device according to claim 1, characterized in that said valve seat ring is rotatably disposed inside said intake throat.

6. The airway tumble ratio quick adjusting device according to claim 1, characterized in that said valve seat ring is detachably disposed in said intake throat.

7. The airway tumble ratio quick adjusting device according to claim 6, characterized in that said airway core box is provided with a locking device for locking the position of said valve seat ring.

8. The device for rapidly adjusting the tumble ratio of the air passage according to claim 7, wherein a locking threaded hole communicated to the side wall of the air inlet throat opening is formed in the outer side of the air passage core box, and the locking device is a set screw matched with the locking threaded hole.

9. The rapid airway tumble ratio adjusting device according to claim 1, wherein said tumble tip angle and said valve seat ring are of an integral structure.

10. The device for rapidly adjusting the tumble ratio of the air passage according to claim 1, wherein said air passage core box comprises one or at least two of said air inlet channels, and said air inlet throat of each of said air inlet channels is provided with one of said valve retainer.

11. The device for rapidly adjusting the air passage tumble ratio according to claim 1, characterized in that a mounting structure for detachably connecting and fixing with a test bed is arranged outside the air passage core box.

12. A blowing test device comprises a test bed, a simulation cylinder sleeve, a momentum moment instrument, a pressure stabilizing cylinder, a suction device, a pressure sensor and a flowmeter, wherein the simulation cylinder sleeve and the pressure stabilizing cylinder are sequentially connected below the test bed, the pressure stabilizing cylinder is connected to the suction device through an exhaust pipeline, the momentum moment instrument is positioned in the simulation cylinder sleeve and used for detecting the tumble ratio in the simulation cylinder sleeve, the pressure sensor is used for detecting the pressure in the simulation cylinder sleeve and the pressure stabilizing cylinder, the flowmeter is used for detecting the gas flow of the exhaust pipeline, the blowing test device is characterized by further comprising the air passage tumble ratio quick adjusting device according to any one of claims 1 to 11, and air valves are respectively installed on each air inlet channel of an air passage core box.

13. A blow test device according to claim 12, characterised in that the exhaust line between the flow meter and the suction device is arranged with a surge tank.

14. A blow test device according to claim 12, further comprising a data transmission device and a computer, the data transmission device being communicatively connected to the moment of momentum meter, the pressure sensor and the flow meter.

15. A blow test device according to any of claims 12 to 14 wherein the suction device is a variable frequency fan.

16. A blow test method characterized by being applied to the blow test apparatus according to any one of claims 12 to 15, comprising the steps of:

setting a plurality of different valve lifts and a plurality of different installation angles of a valve seat ring in an air inlet throat;

the valve seat ring is adjusted to be at different installation angles one by one, the installation angles of the valve seat ring are locked after the installation angles are adjusted once, then different valve lifts are adjusted one by one, blowing tests are carried out respectively, and test result data corresponding to each valve lift are recorded respectively.

17. A blow test method according to claim 16, wherein the test result data comprises tumble ratio, flow coefficient and pressure.

Background

The air flow movement form in the cylinder of the internal combustion engine has decisive influence on the formation and the combustion process of the mixed gas, meanwhile, the combustion quality in the cylinder deeply influences the indexes of the engine such as dynamic property, economical efficiency and emission, and good air flow organization has important effects on improving the combustion rate and improving the mixing of air and unburned fuel in the cylinder. For a gas engine or a gasoline engine, the appropriate tumble strength is favorable for improving the flame propagation rate in a cylinder and inhibiting combustion cycle variation, the momentum attenuation of the tumble is small in the compression process, the tumble can be reserved to the end of a compression stroke, and the large-scale tumble is broken into a plurality of small-scale turbulences along with the progress of the compression stroke, so that the turbulence strength and the turbulence energy are increased, the in-cylinder combustion is favorably improved, and the engine performance is improved.

At present, the tumble forms in various ways, and the traditional tumble forms depend on the shape and arrangement form of the air inlet, that is, key features influencing the tumble generation are generally arranged on the inner side of the air inlet. The air inlet channel is generally formed by processing through a casting process, and the consistency of the tumble ratio of each cylinder of the connected cylinder cover is poor due to casting deviation, so that in the process of developing the air channel of the cylinder cover by fixing the tumble ratio, in order to ensure the consistency of the tumble ratio of each cylinder, an air channel core box is required to be manufactured in advance and subjected to an air blowing test, the air channel core box is required to be repaired repeatedly according to the air blowing test result, and the optimal air channel structure and arrangement form matched with the target tumble ratio, the flow coefficient and the like can be determined after different air channel sand cores are tested for multiple times. Therefore, the tumble ratio is difficult to determine quickly in the development process of the cylinder cover air passage in the prior art, and the defects of high difficulty and low efficiency exist.

Therefore, how to realize the rapid adjustment of the air passage tumble ratio and improve the consistency of the tumble ratio of each cylinder is a technical problem which needs to be solved by the technical personnel in the field at present.

Disclosure of Invention

In view of this, the present invention provides a device for rapidly adjusting an airway tumble ratio, which can achieve rapid adjustment and determination of the airway tumble ratio during a blowing test, and improve consistency of the tumble ratios of cylinders. Another object of the present invention is to provide a blowing test device including the air passage tumble ratio rapid adjustment device and a blowing test method.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides an air flue rolls and flows than quick adjustment device, includes the air flue core box, be equipped with the intake duct in the air flue core box, the intake throat mouth inboard of intake duct is provided with along circumference position adjustable valve seat circle, the inner wall of valve seat circle is equipped with rolls and flows the closed angle, it is in to roll and flow the closed angle the axial projection of the up end of valve seat circle is the closed angle projection, the closed angle projection form by the inboard edge of valve seat circle along radial to the convex bulge region in center of valve seat circle, the closed angle projection is being followed the width at the ascending middle part of valve seat circle circumference direction is greater than the width at its both ends.

Preferably, one side edge of the projection of the sharp corner, which faces the center of the valve seat ring, is a sharp corner characteristic line, and the sharp corner characteristic line is an arc line, a straight line or a fold line.

Preferably, the sharp corner projects as a crescent shaped region with the concave side disposed towards the center of the valve seat insert.

Preferably, an angle scale mark is arranged on the circumferential direction of the outer end face of the air inlet throat, and an indication mark used for indicating scales is arranged on the lower end face of the valve seat ring.

Preferably, the valve seat ring is rotatably disposed inside the intake throat.

Preferably, the valve seat insert is removably disposed within the intake throat.

Preferably, the air duct core box is provided with a locking device for locking the position of the valve seat ring.

Preferably, the outer side of the air passage core box is provided with a locking threaded hole communicated to the side wall of the air inlet throat, and the locking device is a set screw matched with the locking threaded hole.

Preferably, the tumble flow cusp and the valve seat ring are of an integral structure.

Preferably, the air channel core box comprises one or at least two air inlet channels, and one valve seat ring is installed on the air inlet throat of each air inlet channel.

Preferably, the outer side of the air channel core box is provided with a mounting structure which is detachably connected and fixed with the test bed.

The invention provides an air flue tumble ratio quick adjusting device which comprises an air flue core box, wherein an air inlet channel is arranged in the air flue core box, an air valve seat ring with an adjustable circumferential position is arranged on the inner side of an air inlet throat opening of the air inlet channel, a tumble closed angle is arranged on the inner wall of the air valve seat ring, the axial projection of the tumble closed angle on the upper end surface of the air valve seat ring is a closed angle projection, the closed angle projection forms a convex area which is projected from the inner side edge of the air valve seat ring to the center of the air valve seat ring along the radial direction, and the width of the closed angle projection in the middle along the circumferential direction of the air valve seat ring is larger than the width of the two ends of the closed angle projection.

The working principle of the invention is as follows:

before a blowing test, the valve seat ring is adjusted to a certain installation angle relative to an air inlet throat of an air passage core box, and then the air passage core box is installed on the blowing test device and connected with each pipeline. During testing, the valve lift is adjusted to be an initial value, then the air suction device is started, and after the pressure of the testing device is stable, data such as the tumble ratio, the flow coefficient, the pressure and the like are recorded. And then, after the valve lift is continuously adjusted, carrying out a test again and recording data, repeating the test until the data corresponding to each valve lift is tested, and ending the test process of the valve seat ring for a single specific angle of the air passage core box. And then, adjusting the valve seat ring to another mounting angle, and then testing each valve in the lift range to finish the testing process of another specific angle of the valve seat ring relative to the air channel core box. By repeating the steps, the statistical data such as the air passage flow coefficient, the tumble ratio and the like corresponding to each angle of the valve seat relative to the air passage core box can be obtained. Through analyzing the data table, a proper flow coefficient and tumble ratio combination can be selected, and in the process of developing the cylinder cover air passage by fixing the tumble ratio, the optimal installation angle of the valve seat ring relative to the air passage core box can be quickly determined in a table look-up mode, so that the final air passage arrangement structure of the cylinder cover is determined.

In the test process, gas flows into the test device after passing through the gas inlet channel and the valve seat ring, and because the inner side of the valve seat ring is provided with the tumble closed angle structure, the tumble closed angle can extrude gas to the opposite side of the tumble closed angle, so that most of the gas flow enters the simulation cylinder sleeve of the test device from the gap on the opposite side of the tumble closed angle, the gas flow on one side of the tumble closed angle is reduced, and the gas flows on the two sides can more easily form large-scale tumble motion after entering the simulation cylinder sleeve. When the valve seat ring is adjusted to different angles, the tumble ratio in the simulated cylinder sleeve is correspondingly changed.

The invention transfers key characteristics influencing the formation of the tumble to the valve seat ring from the air passage, can improve the consistency of products, avoids the change of the performance of the air passage caused by casting deviation, can quickly determine the optimal installation angle of the valve seat ring of each air passage in a table look-up mode for the conjoined cylinder cover in the process of developing the air passage of the cylinder cover by fixing the tumble ratio, can improve the consistency of the tumble ratio of each cylinder without adopting different air passage sand cores, and reduces the difficulty of casting the cylinder cover. When the air passage tumble ratio quick adjusting device provided by the invention is used for a blowing test, the air passage core box is not required to be repeatedly repaired, and the air passage tumble ratio can be quickly adjusted by only adjusting the mounting angle of the valve seat ring, so that the testing efficiency is greatly improved.

The invention also provides a blowing test device which comprises a test bed, a simulation cylinder sleeve, a momentum moment instrument, a pressure stabilizing cylinder, a wind suction device, a pressure sensor and a flowmeter, wherein the simulation cylinder sleeve and the pressure stabilizing cylinder are sequentially connected below the test bed, the pressure stabilizing cylinder is connected to the wind suction device through an exhaust pipeline, the momentum moment instrument is positioned in the simulation cylinder sleeve and used for detecting the tumble ratio in the simulation cylinder sleeve, the pressure sensor is used for detecting the pressure in the simulation cylinder sleeve and the pressure stabilizing cylinder, the flowmeter is used for detecting the gas flow of the exhaust pipeline, the blowing test device further comprises the air passage tumble ratio quick adjusting device, and each air inlet passage of the air passage core box is provided with an air valve. The derivation process of the beneficial effect generated by the blowing test device is substantially similar to the derivation process of the beneficial effect brought by the air passage tumble ratio quick adjustment device, and therefore the description is omitted here.

Preferably, a pressure stabilizing box is arranged on the exhaust pipeline between the flow meter and the air suction device.

Preferably, the blowing test device further comprises a data transmission device and a computer, wherein the data transmission device is in communication connection with the moment of momentum meter, the pressure sensor and the flowmeter.

Preferably, the air suction device is a variable frequency fan.

The invention also provides a blowing test method, which is applied to the blowing test device and comprises the following steps:

setting a plurality of different valve lifts and a plurality of different installation angles of a valve seat ring in an air inlet throat;

the valve seat ring is adjusted to be at different installation angles one by one, the installation angles of the valve seat ring are locked after the installation angles are adjusted once, then different valve lifts are adjusted one by one, blowing tests are carried out respectively, and test result data corresponding to each valve lift are recorded respectively.

Preferably, the test result data includes a tumble ratio, a flow coefficient, and a pressure.

Through the blowing test method, the statistical data of the corresponding air passage flow coefficient and the corresponding tumble ratio of the valve seat relative to the air passage core box at each installation angle can be obtained, the rapid adjustment and determination of the tumble ratio of the air passage can be realized, and the test efficiency is greatly improved. In the process of developing the cylinder cover air passage by fixing the tumble ratio, the optimal installation angle of the valve seat ring of each air passage can be quickly determined for the connected cylinder cover in a table look-up mode, different air passage sand cores are not needed, the consistency of the tumble ratio of each cylinder can be improved, and the difficulty in casting the cylinder cover is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic external structural view of a device for rapidly adjusting a tumble ratio of an air passage according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the device for rapidly adjusting the tumble ratio of the air passage according to the embodiment of the present invention;

FIG. 3 is a schematic view of a locking device for locking the mounting angle of a valve seat insert according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of a valve seat insert according to an embodiment of the present invention;

FIG. 5 is a longitudinal cross-sectional view of a valve seat insert in an embodiment of the present invention;

FIG. 6 is a schematic view of a projection of a tumble tip angle onto an upper end surface of a valve seat insert in an embodiment of the present invention;

FIG. 7 is a bottom view of an air duct core box in an embodiment of the present invention;

FIG. 8 is a schematic diagram of a hardware arrangement of a blowing test apparatus according to an embodiment of the present invention;

fig. 9 is a schematic view of the overall arrangement of the blowing test device in the embodiment of the present invention.

The meaning of the individual reference numerals in fig. 1 to 9 is as follows:

the test bed comprises an air passage core box 1, an air passage core box 2, an air valve 2, an air passage air inlet 11, an air passage air inlet 12, an air inlet throat 13, a locking threaded hole 14, an air passage 3, an air valve seat ring 31, a tumble sharp angle, a set screw 4, an indication mark 32, a sharp angle projection 33, a sharp angle characteristic line 34, a valve seat ring center 30, an angle scale mark 15, a simulation cylinder sleeve 5, a pressure stabilizing cylinder 6, a flowmeter 7, a pressure stabilizing box 8, a blower 9, a motor 10, a test bed 16, a momentum moment instrument 17, a pressure sensor 18, an exhaust pipeline 19, a frequency converter 20, a data transmission device 21 and a computer 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 7, fig. 1 is an external structural schematic view of a device for rapidly adjusting a tumble ratio of an air passage according to an embodiment of the present invention; FIG. 2 is a schematic diagram of the internal structure of the device for rapidly adjusting the tumble ratio of the air passage according to the embodiment of the present invention; FIG. 3 is a schematic view of a locking device for locking the mounting angle of a valve seat insert according to an embodiment of the present invention; FIG. 4 is a schematic illustration of a valve seat insert according to an embodiment of the present invention; FIG. 5 is a longitudinal cross-sectional view of a valve seat insert in an embodiment of the present invention; FIG. 6 is a schematic view of a projection of a tumble tip angle onto an upper end surface of a valve seat insert in an embodiment of the present invention; FIG. 7 is a bottom view of an air duct core box in an embodiment of the present invention.

When a blowing test is carried out on a cylinder cover, in order to realize the rapid adjustment and determination of the air passage tumble ratio, the invention provides the rapid adjustment device of the air passage tumble ratio, which comprises an air passage core box 1, wherein an air inlet channel 14 is arranged in the air passage core box 1, an air inlet throat 12 (namely an outlet of the air inlet channel 14) of the air inlet channel 14 is internally provided with an air valve seat ring 3 with an adjustable circumferential position, the inner wall of the air valve seat ring 3 is provided with a tumble sharp angle 31, the axial projection of the tumble sharp angle 31 on the upper end surface of the air valve seat ring 3 is a sharp angle projection 33, the sharp angle projection 33 forms a convex area which is projected from the inner side edge of the air valve seat ring 3 to the center of the air valve seat ring 3 (namely the air valve seat ring center 30 in fig. 6) along the radial direction, and the width of the middle part of the sharp angle projection 33 along the circumferential direction of the air valve seat ring 3 is larger than the widths of the two ends. It should be noted that the air passage tumble ratio quick adjustment device may further include an air valve 2, that is, each air inlet passage 14 may be equipped with an air valve 2, the air valve 2 is used in cooperation with the air valve seat ring 3, and when a blowing test is performed, the air valve 2 is opened according to a certain air valve lift, so that a real intake air flow condition is conveniently simulated. The air duct core box 1 is also provided with an air duct air inlet 11, i.e. an inlet of an air duct 14. When a blow test is performed, intake air flows into the air inlet channel 14 from the air inlet 11 of the air flue, and then enters the simulated cylinder liner from the air inlet throat 12 at the other end of the air inlet channel 14.

The working principle of the invention is as follows:

before a blowing test, the valve seat ring 3 is adjusted to a certain installation angle relative to the air inlet throat 12 of the air passage core box 1, and then the air passage core box 1 is installed on a test bed of the blowing test device and connected with various pipelines. During testing, the valve lift of the valve 2 is adjusted to be an initial value, then the air suction device is started, and after the pressure of the testing device is stable, data such as the tumble ratio, the flow coefficient, the pressure and the like are recorded. And then, after the valve lift is continuously adjusted, carrying out a test again and recording data, repeating the test until the data corresponding to each valve lift is tested, and ending the test process of the valve seat ring 3 for a single specific angle of the air passage core box 1. And then, adjusting the valve seat insert 3 to another mounting angle, and then testing each valve lift to finish the testing process of another specific angle of the valve seat insert 3 relative to the air channel core box 1. By repeating the above steps, statistical data such as the air passage flow coefficient and the tumble ratio corresponding to each angle of the valve seat insert 3 relative to the air passage core box 1 can be obtained. Through analyzing the data table, a proper flow coefficient and a proper tumble ratio combination can be selected, and in the process of developing the cylinder cover air passage by fixing the tumble ratio, the optimal installation angle of the valve seat ring 3 relative to the air passage core box 1 can be quickly determined in a table look-up mode, so that the final air passage arrangement structure of the cylinder cover is determined.

In the test process, gas enters the test device after flowing through the air inlet channel 14 and the valve seat ring 3, and because the inner side of the valve seat ring 3 is provided with the tumble sharp angle 31 structure, the tumble sharp angle 31 can extrude and cast the gas to the opposite side of the tumble sharp angle 31, so that most of the gas flow enters the simulated cylinder sleeve of the test device from the gap on the opposite side of the tumble sharp angle 31, the gas flow on one side of the tumble sharp angle 31 is reduced, and the gas flows on the two sides can more easily form large-scale tumble motion after entering the simulated cylinder sleeve. After the valve seat ring 3 is adjusted to different installation angles, the tumble ratio in the simulated cylinder liner can be correspondingly changed due to the combined action of the tumble sharp angle 31 and the internal structure of the air inlet channel 14.

The invention transfers key characteristics influencing the formation of the tumble to the valve seat ring 3 from the air passage, can improve the consistency of products, avoids the change of the performance of the air passage caused by casting deviation, can quickly determine the optimal installation angle of the valve seat ring 3 of each air passage in a table look-up mode for the conjoined cylinder cover in the process of developing the air passage of the cylinder cover by fixing the tumble ratio, can improve the consistency of the tumble ratio of each cylinder without adopting different air passage sand cores, and reduces the difficulty of casting the cylinder cover. When the air passage tumble ratio quick adjusting device provided by the invention is used for a blowing test, the air passage core box is not required to be repeatedly repaired, and the air passage tumble ratio can be quickly adjusted by only adjusting the mounting angle of the valve seat ring, so that the testing efficiency is greatly improved.

The tumble flow cusp 31 in this embodiment may be formed integrally with the valve seat ring 3, for example, by integral casting, forging, machining, or the like, so that the tumble flow cusp 31 and the valve seat ring 3 are formed integrally. By processing the tumble sharp corner 31 on the inner wall of the valve seat ring 3, the guide projection effect of the intake airflow at the tail end of the intake path can be realized, so that the intake airflow is guided and projected to the maximum extent, and the tumble motion is favorably formed in the cylinder.

It should be noted that the tumble sharp corner 31 in this solution functions to extrude most of the air flow to one side before the intake air flow is injected into the simulated cylinder liner, and the tumble sharp corner 31 capable of achieving the above function may be designed in various structural shapes, and in this solution, one side edge of the sharp corner projection 33 facing the valve seat ring center 30 is defined as a sharp corner characteristic line 34, and the sharp corner characteristic line 34 may be designed in an arc shape, a straight shape, a broken line shape, or other curved structures. Preferably, the cusp projection 33 in this solution is a crescent shaped area, and the concave side of the crescent shaped area is arranged towards the valve seat center 30, i.e. the side edge of the tumble cusp 31 towards the valve seat center 30 is designed as a concave arc, as shown in fig. 6.

It should be noted that the tumble flow sharp corner 31 specifically includes an upper side guide surface and a lower side processing surface, a junction of the upper side guide surface and the lower side processing surface is an edge of the tumble flow sharp corner 31 protruding toward the valve seat ring center 30, the tumble flow sharp corner 31 may be designed to have different structures, and the lower side processing surface may be specifically designed to be a rotary processing surface, or a plurality of planes connected in sequence, or other curved surface structures. Preferably, in the scheme, the lower side processing surface of the tumble sharp corner 31 is a rotary processing surface surrounding a processing axis, the processing axis can be designed to be overlapped, parallel or relatively obliquely arranged with the central line of the valve seat ring 3, and a generatrix of the rotary processing surface is a straight line, a broken line or a curve.

It should be noted that, according to different bus shapes, the above-mentioned rotary processing surface may be specifically designed into a plurality of different conical surface structures, and preferably, the rotary processing surface in this scheme is a conical processing surface, a processing axis of the conical processing surface coincides with a central line of the valve seat ring 3, and a vertex of the conical processing surface is located above the valve seat ring 3. The specific shape of the tumble flow cusp 31 depends on the size of the cone angle of the conical processing surface, and the larger the cone angle, the sharper the tumble flow cusp 31. Preferably, the value range of the cone angle of the conical processing surface in the scheme is 60-160 degrees, and within the range, the tumble sharp angle 31 can be ensured to have a sharp enough angle, so that the flow velocity mutation and the extrusion effect on the intake air flow are further strengthened.

Preferably, the outer end face of the inlet throat 12 is provided with an angle scale mark 15 in the circumferential direction, and the lower end face of the valve seat ring 3 is provided with an indicating mark 32 for indicating the scale. When the circumferential installation angle of the valve retainer 3 relative to the air inlet throat 12 changes, the indication mark 32 indicates different angle scales, and an operator can conveniently set the installation angle of the valve retainer 3 in the air inlet throat 12 according to the indicated scales. Specifically, angle scale mark 15 can design into a plurality of scale marks or a plurality of dot etc. and index mark 32 of 3 lower extremes of valve seat insert also can design into scale marks or dot etc. preferably, and this scheme designs index mark 32 into sharp groove structure, not only is convenient for process, conveniently observes installation angle moreover.

The circumferential position of the valve seat insert 3 inside the intake throat 12 is adjustable, i.e., the mounting angle is adjustable. It should be noted that the present invention may implement the adjustable installation angle of the valve seat 3 through various structural forms, for example, the valve seat 3 and the intake throat 12 are installed in a rotating fit or a detachable connection manner. In a preferred scheme, the valve seat ring 3 is rotatably arranged on the inner side of the air inlet throat 12, and the installation angle of the valve seat ring 3 can be conveniently adjusted by adopting the installation mode of rotating fit, so that the test efficiency is greatly improved.

In another preferred arrangement, the valve seat insert 3 is removably disposed within the intake throat 12. So set up, this scheme can also allow to change the valve seat insert 3 of different internal diameters or having different tumble closed angle 31 structures to can design different tumble and generate the structure in same kind of air flue core box 1, further improve the convenience of test.

Preferably, the air duct core box 1 is provided with locking means for locking the position of the valve seat insert 3. In the blowing test process, the valve seat ring 3 is fixed at a specific mounting position by using the locking device, so that the test accuracy is improved.

It should be noted that the locking device can be designed in various forms, for example, a screw locking manner, a cam locking manner, etc. In a preferable scheme, the outer side of the air passage core box 1 is provided with a locking threaded hole 13 communicated to the side wall of the air inlet throat 12, as shown in fig. 1, and the locking device is a set screw 4 matched with the locking threaded hole 13, as shown in fig. 3. After the valve retainer 3 is installed in place, the installation angle of the valve retainer 3 can be fixed by screwing the set screw 4.

Preferably, the air duct core box 1 comprises one or at least two air inlet channels 14, and an air inlet throat 12 of each air inlet channel 14 is provided with a valve seat ring 3. The conjoined cylinder cover generally corresponds to a plurality of cylinders, and when the conjoined cylinder cover is designed and developed, the air passage core box 1 needs to be designed to be consistent with the number of the air passages of the conjoined cylinder cover, namely, the air passage core box 1 is provided with one or more air inlet channels 14 corresponding to a plurality of simulated cylinder sleeves. During the test, the installation angles of the respective valve retainer 3 in the intake throat 12 may be adjusted simultaneously or not.

Preferably, the outer side of the air channel core box 1 is provided with a mounting structure which is detachably connected and fixed with the test bed. Specifically, the mounting structure may be designed as a bolt connection structure, or a clip type quick-release structure, etc.

Referring to fig. 8 and 9, the invention further provides a blowing test device, which comprises a test bed 16, a simulation cylinder sleeve 5, a moment of momentum instrument 17, a pressure stabilizing cylinder 6, a suction device, a pressure sensor 18 and a flow meter 7, wherein the simulation cylinder sleeve 5 and the pressure stabilizing cylinder 6 are sequentially connected below the test bed 16, the pressure stabilizing cylinder 6 is connected with the suction device through an exhaust pipeline 19, the moment of momentum instrument 17 is positioned in the simulation cylinder sleeve 5 and used for detecting the tumble ratio in the simulation cylinder sleeve 5, the pressure sensor 18 is used for detecting the pressure in the pressure stabilizing cylinder 6 and the simulation cylinder sleeve 5 (the pressure in the pressure stabilizing cylinder 6 and the pressure in the simulation cylinder sleeve 5 are equal), the flow meter 7 is used for detecting the gas flow of the exhaust pipeline 19, the blowing test device further comprises the air passage tumble ratio quick adjusting device, and each air inlet 14 of the air passage core box 1 is provided with an air valve 2. During testing, the air flue core box 1 is placed above the test bed 16, and the air suction device generates negative pressure in the simulation cylinder sleeve 5 through the exhaust pipeline 19, so that air inflow can flow into the simulation cylinder sleeve 5 through the air inlet channel 14 of the air flue core box 1.

The derivation process of the beneficial effects of the blowing test device provided by the invention is substantially similar to the derivation process of the beneficial effects brought by the air passage tumble ratio quick adjustment device, so that the details are not repeated herein.

Preferably, a pressure stabilizing box 8 is arranged in the exhaust pipeline 19 between the flowmeter 7 and the air suction device, and the pressure stabilizing box plays a role in stabilizing air flow.

Preferably, the blowing test device further comprises a data transmission device 21 and a computer 22, the data transmission device 21 is in communication connection with the moment of momentum instrument 17, the pressure sensor 18 and the flowmeter 7, the data transmission device 21 is responsible for inputting and outputting signals, and test result data such as the tumble ratio, the pressure and the flow coefficient can be transmitted to the computer 22.

Preferably, the output power of the air suction device in the present solution is adjustable, i.e. the pressure inside the simulation cylinder casing 5 can be adjusted by changing the output power of the air suction device. Preferably, the device that induced drafts in this scheme is the frequency conversion fan, and is concrete, and the frequency conversion fan includes fan 9 and is used for driving motor 10 of fan 9 operation, and motor 10 is equipped with converter 20, and the rotational speed of motor 10 passes through converter 20 control to the rotational speed of regulation fan 9. The frequency converter 20 is also in communication connection with the data transmission device 21, and the computer 22 can monitor the gas flow of the exhaust pipeline 19 and the pressure value in the pressure stabilizing cylinder 6, and can control the rotating speed of the fan 9 by controlling the frequency of the frequency converter 20, so as to control the gas flow of the exhaust pipeline 19.

The invention also provides a blowing test method, which is applied to the blowing test device and comprises the following steps:

1) setting a plurality of different valve lifts and a plurality of different installation angles of the valve seat ring 3 in the air inlet throat 12;

2) the valve seat insert 3 is adjusted to be at different installation angles one by one, after the installation angle is adjusted once, the installation angle of the valve seat insert 3 is locked, then different valve lifts are adjusted one by one, blowing tests are carried out respectively, and test result data corresponding to each valve lift are recorded respectively.

Preferably, the test result data includes data of a tumble ratio, a flow coefficient, a pressure, and the like.

The specific implementation process of the blowing test method provided by the invention is described by the specific test process.

Before the test starts, the air passage core box 1 to be tested is installed on the test bed 16, the air passage core box 1 is aligned with the simulation cylinder sleeve 5 in a straight opening positioning mode, the air passage core box 1 can be tightly pressed on the test bed 16 in a bolt connection mode, and then a front pipeline and a rear pipeline such as an air inlet pipeline, an exhaust pipeline 19 and the like are connected. Assuming that the maximum valve lift of the valve 2 is 10mm and the change amount of each adjustment of the valve lift is 2mm, the total number of the valve lifts to be tested is five, namely 2mm, 4mm, 6mm, 8mm and 10 mm. Assuming that the rotatable angle range of the valve retainer 3 relative to the air inlet throat 12 is 0-360 degrees, and the change value of the installation angle of each adjustment is 30 degrees, the number of the installation angles to be tested is 12, namely, 0 degree, 30 degrees, 60 degrees, 90 degrees, 120 degrees, 150 degrees, 180 degrees, 210 degrees, 240 degrees, 270 degrees, 300 degrees and 330 degrees. Before testing, the pressure in the pressure stabilizing cylinder 6 and the simulated cylinder sleeve 5 needs to be stabilized, the pressure regulation process can be realized by means of a computer 22 and a frequency converter 20, firstly, a target pressure value (the difference value between the pressure in the pressure stabilizing cylinder 6 and the atmospheric pressure) is input into the computer 22, the pressure sensor 18 at the pressure stabilizing cylinder 6 feeds back the pressure value to the computer 22, an actual pressure value is obtained through calculation, and the actual pressure value is compared with the target pressure value. If the actual pressure value is smaller than the target pressure value, it indicates that the power of the fan 9 is smaller, at this time, the computer 22 may control the frequency converter 20 to increase by a preset step length until the actual pressure value reaches the target pressure value, and at this time, the frequency of the frequency converter 20 is fixed. On the contrary, when the actual pressure value is greater than the target pressure value, the computer 22 controls the frequency converter 20 to decrease by a preset step length until the actual pressure value decreases to the target pressure value, and at this time, the frequency of the frequency converter 20 is fixed. And after the pressure value measured by the pressure sensor 18 is stable, starting the blowing test, carrying out the blowing test when the installation angle of the valve seat ring 3 is 0 degrees and the valve lift is 2mm, and recording data such as the tumble ratio, the pressure, the flow and the like. And then, adjusting the valve lift to be 4mm, performing the blowing test again, recording test result data, repeating the steps until the valve lift is adjusted to be 10mm, and finishing the test process of the valve seat ring 3 when the installation angle is 0 degree. Then, the valve seat insert 3 is rotated to be adjusted to the installation angle of 30 degrees, and then the test under each valve lift is carried out, so that the test process of the valve seat insert 3 relative to the air channel core box 1 at another specific angle is completed. By repeating the steps, the statistical data of the corresponding air passage flow coefficient and the corresponding tumble ratio of the valve seat insert 3 relative to the air passage core box 1 at each installation angle can be obtained.

Through analyzing the data table, a combination of a proper flow coefficient and an appropriate vortex ratio can be selected, when the cylinder cover air passage is developed by fixing the tumble ratio, the optimal installation angle of the valve seat ring 3 relative to the air passage core box 1 can be quickly determined in a table look-up mode, and the finally determined structures of the air passage core box 1 and the valve seat ring 3 are the air passage and valve seat ring structure of the developed cylinder cover.

By the blowing test method, the air passage tumble ratio can be quickly adjusted and determined, and the test efficiency is greatly improved. In the process of developing the cylinder cover air passage by fixing the tumble ratio, the optimal installation angle of the valve seat ring 3 of each air passage can be quickly determined by a table look-up mode for the connected cylinder cover, different air passage sand cores are not needed, the consistency of the tumble ratio of each cylinder can be improved, and the difficulty of cylinder cover casting is reduced.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.